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[package]
name = "tun2proxy"
version = "0.1.0"
authors = ["B. Blechschmidt"]
edition = "2018"
[dependencies]
smoltcp = { version="0.8.0", git="https://github.com/smoltcp-rs/smoltcp", features = ["std"], rev="cb1828cbe6d19b10cb50d3e4323fa8c5ca25e5e4" }
mio = { version="0.7", features = ["os-poll", "net", "os-util"]}
clap = { version = "2.33.3" }
chrono = {version = "" }

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This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# tun2proxy
Tunnel TCP traffic through SOCKS5 or HTTP on Linux.
**Authentication not yet supported. Error handling incomplete and too restrictive.**
## Build
Clone the repository and `cd` into the project folder. Then run the following:
```
cargo build --release
```
## Setup
A standard setup, which would route all traffic from your system through the tunnel interface, could look as follows:
```
# Create a tunnel interface named tun0 which your user can bind to.
sudo ip tuntap add name tun0 mode tun user $USER
sudo ip link set tun0 up
# To prevent a loop, replace 1.2.3.4 with the IP address of the proxy server.
# This will add a route to the proxy server that behaves like the default route.
sudo ip route add 1.2.3.4 $(ip route | grep '^default' | cut -d' ' -f2-)
# Route all your traffic through tun0 without interfering with the default route.
sudo ip route add 8.0.0.0/1 dev tun0
sudo ip route add 0.0.0.0/1 dev tun0
# Again, replace 1.2.3.4 with the IP address of the proxy server.
./target/release/tun2proxy --tun tun0 --socks5 1.2.3.4
```
Note that if you paste these commands into a shell script, which you then run with `sudo`, you might want to replace
`$USER` with `$SUDO_USER`.
## CLI
```
tun2proxy 0.1.0
Tunnel interface to proxy.
USAGE:
tun2proxy [OPTIONS] --tun <TUN>
FLAGS:
--help Prints help information
-V, --version Prints version information
OPTIONS:
-h, --http <IP:PORT> HTTP server to use
-s, --socks5 <IP:PORT> SOCKS5 server to use
-t, --tun <TUN> Name of the tun interface
```

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use crate::tun2proxy::{Connection, TcpProxy, IncomingDirection, OutgoingDirection, OutgoingDataEvent, IncomingDataEvent, ConnectionManager};
use std::collections::VecDeque;
use std::net::SocketAddr;
#[derive(Eq, PartialEq, Debug)]
#[allow(dead_code)]
enum HttpState {
SendRequest,
ExpectResponse,
Established
}
pub struct HttpConnection {
state: HttpState,
client_inbuf: VecDeque<u8>,
server_inbuf: VecDeque<u8>,
client_outbuf: VecDeque<u8>,
server_outbuf: VecDeque<u8>,
data_buf: VecDeque<u8>,
crlf_state: u8
}
impl HttpConnection {
fn new(connection: &Connection) -> Self {
let mut result = Self {
state: HttpState::ExpectResponse,
client_inbuf: Default::default(),
server_inbuf: Default::default(),
client_outbuf: Default::default(),
server_outbuf: Default::default(),
data_buf: Default::default(),
crlf_state: Default::default()
};
result.server_outbuf.extend(b"CONNECT ".iter());
result.destination_to_server_outbuf(connection);
result.server_outbuf.extend(b" HTTP/1.1\r\nHost: ".iter());
result.destination_to_server_outbuf(connection);
result.server_outbuf.extend(b"\r\n\r\n".iter());
result
}
fn destination_to_server_outbuf(&mut self, connection: &Connection) {
let ipv6 = connection.dst.is_ipv6();
if ipv6 {
self.server_outbuf.extend(b"[".iter());
}
self.server_outbuf.extend(connection.dst.ip().to_string().as_bytes());
if ipv6 {
self.server_outbuf.extend(b"]".iter());
}
self.server_outbuf.extend(b":".iter());
self.server_outbuf.extend(connection.dst.port().to_string().as_bytes());
}
fn state_change(&mut self) {
match self.state {
HttpState::ExpectResponse => {
let mut counter = 0usize;
for b_ref in self.server_inbuf.iter() {
let b = *b_ref;
if b == b'\n' {
self.crlf_state += 1;
} else if b != b'\r' {
self.crlf_state = 0;
}
counter += 1;
if self.crlf_state == 2 {
self.server_inbuf.drain(0..counter);
self.server_outbuf.append(&mut self.data_buf);
self.data_buf.clear();
self.client_outbuf.extend(self.server_inbuf.iter());
self.server_outbuf.extend(self.client_inbuf.iter());
self.server_inbuf.clear();
self.client_inbuf.clear();
self.state = HttpState::Established;
return;
}
}
self.server_inbuf.drain(0..counter);
}
HttpState::Established => {
self.client_outbuf.extend(self.server_inbuf.iter());
self.server_outbuf.extend(self.client_inbuf.iter());
self.server_inbuf.clear();
self.client_inbuf.clear();
}
_ => {
unreachable!();
}
}
}
}
impl TcpProxy for HttpConnection {
fn push_data(&mut self, event: IncomingDataEvent<'_>) {
let direction = event.direction;
let buffer = event.buffer;
match direction {
IncomingDirection::FromServer => {
self.server_inbuf.extend(buffer.iter());
},
IncomingDirection::FromClient => {
if self.state == HttpState::Established {
self.client_inbuf.extend(buffer.iter());
} else {
self.data_buf.extend(buffer.iter());
}
}
}
self.state_change();
}
fn consume_data(&mut self, dir: OutgoingDirection, size: usize) {
let buffer = if dir == OutgoingDirection::ToServer
{
&mut self.server_outbuf
} else {
&mut self.client_outbuf
};
buffer.drain(0..size);
}
fn peek_data(&mut self, dir: OutgoingDirection) -> OutgoingDataEvent {
let buffer = if dir == OutgoingDirection::ToServer {
&mut self.server_outbuf
} else {
&mut self.client_outbuf
};
let event = OutgoingDataEvent {
direction: dir,
buffer: buffer.make_contiguous()
};
return event;
}
}
pub struct HttpManager {
server: std::net::SocketAddr,
}
impl ConnectionManager for HttpManager {
fn handles_connection(&self, connection: &Connection) -> bool {
connection.proto == smoltcp::wire::IpProtocol::Tcp.into()
}
fn new_connection(&mut self, connection: &Connection) -> Option<std::boxed::Box<dyn TcpProxy>> {
if connection.proto != smoltcp::wire::IpProtocol::Tcp.into() {
return None;
}
Some(std::boxed::Box::new(HttpConnection::new(&connection)))
}
fn close_connection(&mut self, _: &Connection) {}
fn get_server(&self) -> SocketAddr {
self.server
}
}
impl HttpManager {
pub fn new(server: SocketAddr) -> Self {
Self {
server,
}
}
}

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#![feature(deque_make_contiguous)]
mod virtdevice;
mod socks5;
mod http;
mod tun2proxy;
use socks5::*;
use crate::http::HttpManager;
use crate::tun2proxy::TunToProxy;
use std::net::SocketAddr;
use std::str::FromStr;
fn main() {
let matches = clap::App::new(env!("CARGO_PKG_NAME"))
.version(env!("CARGO_PKG_VERSION"))
.about("Tunnel interface to proxy.")
.arg(clap::Arg::with_name("tun")
.short("t")
.long("tun")
.value_name("TUN")
.help("Name of the tun interface")
.required(true)
.takes_value(true))
.arg(clap::Arg::with_name("socks5_server")
.help("SOCKS5 server to use")
.short("s")
.long("socks5")
.value_name("IP:PORT"))
.arg(clap::Arg::with_name("http_server")
.help("HTTP server to use")
.short("h")
.long("http")
.value_name("IP:PORT"))
.get_matches();
if matches.value_of("socks5_server").is_some()
&& matches.value_of("http_server").is_some()
|| matches.value_of("socks5_server").is_none()
&& matches.value_of("http_server").is_none() {
eprintln!("You need to specify exactly one server.");
return;
}
let tun_name = matches.value_of("tun").unwrap();
let mut ttp = TunToProxy::new(tun_name);
if let Some(addr) = matches.value_of("socks5_server") {
if let Ok(server) = SocketAddr::from_str(addr)
{
ttp.add_connection_manager(Box::new(Socks5Manager::new(server)));
} else {
eprintln!("Invalid server address.");
return;
}
}
if let Some(addr) = matches.value_of("http_server") {
if let Ok(server) = SocketAddr::from_str(addr)
{
ttp.add_connection_manager(Box::new(HttpManager::new(server)));
} else {
eprintln!("Invalid server address.");
return;
}
}
ttp.run();
}

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use crate::tun2proxy::{Connection, OutgoingDirection, OutgoingDataEvent, IncomingDirection, IncomingDataEvent, ConnectionManager, TcpProxy};
use std::collections::VecDeque;
use std::net::{IpAddr, SocketAddr};
#[derive(Eq, PartialEq, Debug)]
#[allow(dead_code)]
enum SocksState {
ClientHello,
ServerHello,
SendRequest,
ReceiveResponse,
Established
}
#[allow(dead_code)]
#[repr(u8)]
#[derive(Copy, Clone)]
enum SocksAddressType {
Ipv4 = 1,
DomainName = 3,
Ipv6 = 4
}
#[allow(dead_code)]
#[repr(u8)]
enum SocksAuthentication {
None = 0,
Password = 2
}
pub struct SocksConnection {
connection: Connection,
state: SocksState,
client_inbuf: VecDeque<u8>,
server_inbuf: VecDeque<u8>,
client_outbuf: VecDeque<u8>,
server_outbuf: VecDeque<u8>,
data_buf: VecDeque<u8>,
}
impl SocksConnection {
pub fn new(connection: &Connection) -> Self {
let mut result = Self {
connection: *connection,
state: SocksState::ServerHello,
client_inbuf: Default::default(),
server_inbuf: Default::default(),
client_outbuf: Default::default(),
server_outbuf: Default::default(),
data_buf: Default::default(),
};
result.server_outbuf.extend(&[5u8, 1, 0]);
result.state = SocksState::ServerHello;
result
}
fn forward_data(&mut self) {
self.client_outbuf.extend(self.server_inbuf.iter());
self.server_outbuf.extend(self.client_inbuf.iter());
self.server_inbuf.clear();
self.client_inbuf.clear();
}
pub fn state_change(&mut self) {
let dst_ip = self.connection.dst.ip();
match self.state {
SocksState::ServerHello if self.server_inbuf.len() == 2 => {
assert!(self.server_inbuf[0] == 5 && self.server_inbuf[1] == 0);
self.server_inbuf.drain(0..2);
let cmd = if dst_ip.is_ipv4() { 1 } else { 4 };
self.server_outbuf.extend(&[5u8, 1, 0, cmd]);
match dst_ip {
IpAddr::V4(ip) => self.server_outbuf.extend(ip.octets().as_ref()),
IpAddr::V6(ip) => self.server_outbuf.extend(ip.octets().as_ref()),
};
self.server_outbuf.extend(&[
(self.connection.dst.port() >> 8) as u8,
(self.connection.dst.port() & 0xff) as u8
]);
self.state = SocksState::ReceiveResponse;
}
SocksState::ServerHello if self.server_inbuf.len() > 2 => {
panic!("Socks protocol error!")
}
SocksState::ReceiveResponse if self.server_inbuf.len() >= 4 => {
let _ver = self.server_inbuf[0];
let _rep = self.server_inbuf[1];
let _rsv = self.server_inbuf[2];
let atyp = self.server_inbuf[3];
if atyp != SocksAddressType::Ipv4 as u8
&& atyp != SocksAddressType::Ipv6 as u8
&& atyp != SocksAddressType::DomainName as u8 {
panic!("Invalid address type");
}
if atyp == SocksAddressType::DomainName as u8 && self.server_inbuf.len() < 5 {
return;
}
if atyp == SocksAddressType::DomainName as u8
&& self.server_inbuf.len() < 7 + (self.server_inbuf[4] as usize) {
return;
}
let message_length = if atyp == SocksAddressType::Ipv4 as u8 {
10
} else if atyp == SocksAddressType::Ipv6 as u8 {
22
} else {
7 + (self.server_inbuf[4] as usize)
};
self.server_inbuf.drain(0..message_length);
self.server_outbuf.append(&mut self.data_buf);
self.data_buf.clear();
self.forward_data();
self.state = SocksState::Established;
}
SocksState::Established => {
self.forward_data();
}
_ => {}
}
}
}
impl TcpProxy for SocksConnection {
fn push_data(&mut self, event: IncomingDataEvent<'_>) {
let direction = event.direction;
let buffer = event.buffer;
match direction {
IncomingDirection::FromServer => {
self.server_inbuf.extend(buffer.iter());
},
IncomingDirection::FromClient => {
if self.state == SocksState::Established {
self.client_inbuf.extend(buffer.iter());
} else {
self.data_buf.extend(buffer.iter());
}
}
}
self.state_change();
}
fn consume_data(&mut self, dir: OutgoingDirection, size: usize) {
let buffer = if dir == OutgoingDirection::ToServer
{
&mut self.server_outbuf
} else {
&mut self.client_outbuf
};
buffer.drain(0..size);
}
fn peek_data(&mut self, dir: OutgoingDirection) -> OutgoingDataEvent {
let buffer = if dir == OutgoingDirection::ToServer {
&mut self.server_outbuf
} else {
&mut self.client_outbuf
};
let event = OutgoingDataEvent {
direction: dir,
buffer: buffer.make_contiguous()
};
return event;
}
}
pub struct Socks5Manager {
server: std::net::SocketAddr,
authentication: SocksAuthentication,
username: Vec<u8>,
password: Vec<u8>,
}
impl ConnectionManager for Socks5Manager {
fn handles_connection(&self, connection: &Connection) -> bool {
connection.proto == smoltcp::wire::IpProtocol::Tcp.into()
}
fn new_connection(&mut self, connection: &Connection) -> Option<std::boxed::Box<dyn TcpProxy>> {
if connection.proto != smoltcp::wire::IpProtocol::Tcp.into() {
return None;
}
Some(std::boxed::Box::new(SocksConnection::new(&connection)))
}
fn close_connection(&mut self, _: &Connection) {}
fn get_server(&self) -> SocketAddr {
self.server
}
}
impl Socks5Manager {
pub fn new(server: SocketAddr) -> Self {
Self {
server,
authentication: SocksAuthentication::None,
username: Default::default(),
password: Default::default()
}
}
#[allow(dead_code)]
pub fn set_credentials(&mut self, username: &[u8], password: &[u8]) {
assert!(username.len() <= 255 && password.len() <= 255);
self.authentication = SocksAuthentication::Password;
self.username = Vec::from(username);
self.password = Vec::from(password);
}
}

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use std::collections::{BTreeMap, HashMap};
use std::convert::From;
use std::io::{Read, Write};
use std::net::{IpAddr, SocketAddr, Shutdown};
use std::os::unix::io::AsRawFd;
use mio::{Events, Interest, Poll, Token};
use mio::event::Event;
use mio::net::{TcpSocket as MioTcp, TcpStream};
use mio::unix::SourceFd;
use smoltcp::iface::{Interface, InterfaceBuilder, Routes};
use smoltcp::phy::{Device, Medium, RxToken, TunTapInterface, TxToken};
use smoltcp::socket::{SocketHandle, SocketSet, TcpSocket, TcpSocketBuffer};
use smoltcp::time::Instant;
use smoltcp::wire::{IpAddress, IpCidr, Ipv4Address, Ipv4Packet, TcpPacket, UdpPacket, Ipv6Packet};
use crate::virtdevice::VirtualTunDevice;
#[derive(Hash, Clone, Copy)]
pub struct Connection {
pub src: std::net::SocketAddr,
pub dst: std::net::SocketAddr,
pub proto: u8
}
impl Eq for Connection {}
impl PartialEq<Self> for Connection {
fn eq(&self, other: &Self) -> bool {
return other.src == self.src && other.dst == self.dst && other.proto == self.proto;
}
}
#[derive(Eq, PartialEq, Debug)]
pub(crate) enum IncomingDirection {
FromServer,
FromClient
}
#[derive(Eq, PartialEq, Debug)]
pub(crate) enum OutgoingDirection {
ToServer,
ToClient
}
#[allow(dead_code)]
pub(crate) enum ConnectionEvent<'a> {
NewConnection(&'a Connection),
ConnectionClosed(&'a Connection)
}
pub(crate) struct DataEvent<'a, T> {
pub(crate) direction: T,
pub(crate) buffer: &'a [u8]
}
pub(crate) type IncomingDataEvent<'a> = DataEvent<'a, IncomingDirection>;
pub(crate) type OutgoingDataEvent<'a> = DataEvent<'a, OutgoingDirection>;
fn get_transport_info(proto: u8, transport_offset: usize, packet: &[u8]) -> Option<((u16, u16), bool, usize, usize)> {
if proto == smoltcp::wire::IpProtocol::Udp.into() {
match UdpPacket::new_checked(packet) {
Ok(result) => {
Some(((result.src_port(), result.dst_port()), false, transport_offset + 8, packet.len() - 8))
},
Err(_) => None
}
} else if proto == smoltcp::wire::IpProtocol::Tcp.into() {
match TcpPacket::new_checked(packet) {
Ok(result) => {
Some(((result.src_port(), result.dst_port()), result.syn() && !result.ack(),
transport_offset + result.header_len() as usize, packet.len()))
},
Err(_) => None
}
}
else {
None
}
}
fn connection_tuple(frame: &[u8]) -> Option<(Connection, bool, usize, usize)> {
match Ipv4Packet::new_checked(frame) {
Ok(packet) => {
let proto:u8 = packet.protocol().into();
let mut a: [u8; 4] = Default::default();
a.copy_from_slice(packet.src_addr().as_bytes());
let src_addr = IpAddr::from(a);
a.copy_from_slice(packet.dst_addr().as_bytes());
let dst_addr = IpAddr::from(a);
if let Some((ports, first_packet, payload_offset, payload_size))
= get_transport_info(proto,packet.header_len().into(), &frame[packet.header_len().into()..]) {
let connection = Connection {
src: SocketAddr::new(src_addr, ports.0),
dst: SocketAddr::new(dst_addr, ports.1),
proto
};
return Some((connection, first_packet, payload_offset, payload_size));
} else {
return None;
}
}
_ => { }
}
match Ipv6Packet::new_checked(frame) {
Ok(packet) => {
// TODO: Support extension headers.
let proto:u8 = packet.next_header().into();
let mut a: [u8; 16] = Default::default();
a.copy_from_slice(packet.src_addr().as_bytes());
let src_addr = IpAddr::from(a);
a.copy_from_slice(packet.dst_addr().as_bytes());
let dst_addr = IpAddr::from(a);
if let Some((ports, first_packet, payload_offset, payload_size))
= get_transport_info(proto,packet.header_len().into(), &frame[packet.header_len().into()..]) {
let connection = Connection {
src: SocketAddr::new(src_addr, ports.0),
dst: SocketAddr::new(dst_addr, ports.1),
proto
};
Some((connection, first_packet, payload_offset, payload_size))
} else {
None
}
}
_ => None
}
}
struct ConnectionState {
smoltcp_handle: SocketHandle,
mio_stream: TcpStream,
token: Token
}
pub(crate) trait TcpProxy {
fn push_data(&mut self, event: IncomingDataEvent<'_>);
fn consume_data(&mut self, dir: OutgoingDirection, size: usize);
fn peek_data(&mut self, dir: OutgoingDirection) -> OutgoingDataEvent;
}
pub(crate) trait ConnectionManager {
fn handles_connection(&self, connection: &Connection) -> bool;
fn new_connection(&mut self, connection: &Connection) -> Option<std::boxed::Box<dyn TcpProxy>>;
fn close_connection(&mut self, connection: &Connection);
fn get_server(&self) -> SocketAddr;
}
pub(crate) struct TunToProxy<'a> {
tun: TunTapInterface,
poll: Poll,
tun_token: Token,
udp_token: Token,
iface: Interface<'a, VirtualTunDevice>,
connections: HashMap<Connection, ConnectionState>,
managers: HashMap<Connection, std::boxed::Box<dyn TcpProxy>>,
connection_managers: Vec<std::boxed::Box<dyn ConnectionManager>>,
next_token: usize,
token_to_connection: HashMap<Token, Connection>,
socketset: SocketSet<'a>
}
impl<'a> TunToProxy<'a> {
pub(crate) fn new(interface: &str) -> Self {
let tun_token = Token(0);
let tun = TunTapInterface::new(interface, Medium::Ip).unwrap();
let poll = Poll::new().unwrap();
poll.registry().register(&mut SourceFd(&tun.as_raw_fd()), tun_token, Interest::READABLE).unwrap();
let virt = VirtualTunDevice::new(tun.capabilities());
let builder = InterfaceBuilder::new(virt);
let ip_addrs = [
IpCidr::new(IpAddress::v4(0, 0, 0, 1), 0),
];
let mut routes = Routes::new(BTreeMap::new());
routes.add_default_ipv4_route(Ipv4Address::new(0, 0, 0, 1)).unwrap();
let iface = builder.any_ip(true)
.ip_addrs(ip_addrs).routes(routes).finalize();
Self {
tun,
poll,
tun_token,
udp_token: Token(1),
iface,
connections: Default::default(),
next_token: 2,
token_to_connection: Default::default(),
socketset: SocketSet::new([]),
managers: Default::default(),
connection_managers: Default::default()
}
}
pub(crate) fn add_connection_manager(&mut self, manager: Box<dyn ConnectionManager>) {
self.connection_managers.push(manager);
}
fn expect_smoltcp_send(&mut self) {
self.iface.poll(&mut self.socketset, Instant::now()).unwrap();
while let Some(vec) = self.iface.device_mut().exfiltrate_packet() {
let slice = vec.as_slice();
// TODO: Actual write. Replace.
self.tun.transmit().unwrap().consume(Instant::now(), slice.len(), |buf| {
buf[..].clone_from_slice(slice);
Ok(())
}).unwrap();
}
}
fn remove_connection(&mut self, connection: &Connection) {
self.managers.remove(connection);
let mut connection_state = self.connections.remove(connection).unwrap();
self.token_to_connection.remove(&connection_state.token);
self.poll.registry().deregister(&mut connection_state.mio_stream).unwrap();
println!("[{:?}] CLOSE {} -> {} (TCP)", chrono::offset::Local::now(), connection.src, connection.dst);
}
fn get_connection_manager(&self, connection: &Connection) -> Option<&Box<dyn ConnectionManager>>{
for manager in self.connection_managers.iter() {
if manager.handles_connection(connection) {
return Some(manager);
}
}
None
}
fn tunsocket_read_and_forward(&mut self, connection: &Connection) {
if let Some(handler) = self.managers.get_mut(&connection) {
let closed = {
let conn_info = self.connections.get_mut(&connection).unwrap();
let mut socket = self.socketset.get::<TcpSocket>(conn_info.smoltcp_handle);
while socket.can_recv() {
socket.recv(|data| {
let event = IncomingDataEvent {
direction: IncomingDirection::FromClient,
buffer: data,
};
handler.push_data(event);
(data.len(), ())
}).unwrap();
}
socket.state() == smoltcp::socket::TcpState::CloseWait
};
if closed {
let connection_state = self.connections.get_mut(&connection).unwrap();
connection_state.mio_stream.shutdown(Shutdown::Both).unwrap();
self.remove_connection(&connection);
return;
}
}
}
fn receive_tun(&mut self, frame: &mut [u8]) {
if let Some((connection, first_packet, _payload_offset, _payload_size)) = connection_tuple(frame) {
if connection.proto == smoltcp::wire::IpProtocol::Tcp.into() {
let cm = self.get_connection_manager(&connection);
if !cm.is_some() {
return;
}
let server = cm.unwrap().get_server();
if first_packet {
let mut socket = TcpSocket::new(TcpSocketBuffer::new(vec![0; 4096]), TcpSocketBuffer::new(vec![0; 4096]));
socket.set_ack_delay(None);
socket.listen(connection.dst).unwrap();
let handle = self.socketset.add(socket);
let socket = MioTcp::new_v4().unwrap();
let client = socket.connect(server).unwrap();
let token = Token(self.next_token);
self.next_token += 1;
let mut conn = ConnectionState {
smoltcp_handle: handle,
mio_stream: client,
token
};
self.token_to_connection.insert(token, connection);
self.poll.registry().register(&mut conn.mio_stream, token, Interest::READABLE | Interest::WRITABLE).unwrap();
self.connections.insert(connection, conn);
for manager in self.connection_managers.iter_mut() {
if let Some(handler) = manager.new_connection(&connection) {
self.managers.insert(connection, handler);
break;
}
}
println!("[{:?}] CONNECT {} -> {} (TCP)", chrono::offset::Local::now(), connection.src, connection.dst);
} else if !self.connections.contains_key(&connection) {
return;
}
// Inject the packet to advance the smoltcp socket state
self.iface.device_mut().inject_packet(frame);
// Having advanced the socket state, we expect the socket to ACK
// Exfiltrate the response packets generated by the socket and inject them
// into the tunnel interface.
self.expect_smoltcp_send();
// Read from the smoltcp socket and push the data to the connection handler.
self.tunsocket_read_and_forward(&connection);
// The connection handler builds up the connection or encapsulates the data.
// Therefore, we now expect it to write data to the server.
self.write_to_server(&connection);
}
else if connection.proto == smoltcp::wire::IpProtocol::Udp.into() {
/* // UDP is not yet supported.
if payload_offset > frame.len() || payload_offset + payload_offset > frame.len() {
return;
}
let payload = &frame[payload_offset..payload_offset+payload_size]; */
}
}
}
fn write_to_server(&mut self, connection: &Connection) {
if let Some(handler) = self.managers.get_mut(&connection) {
let event = handler.peek_data(OutgoingDirection::ToServer);
if event.buffer.len() == 0 {
return;
}
let connection_state = self.connections.get_mut(&connection).unwrap();
let result = connection_state.mio_stream.write(event.buffer);
match result {
Ok(consumed) => {
handler.consume_data(OutgoingDirection::ToServer, consumed);
}
Err(error) if error.kind() != std::io::ErrorKind::WouldBlock => {
panic!("Error: {:?}", error);
}
_ => {
// println!("{:?}", result);
}
}
}
}
fn write_to_client(&mut self, connection: &Connection) {
if let Some(handler) = self.managers.get_mut(&connection) {
let event = handler.peek_data(OutgoingDirection::ToClient);
let socket = &mut self.socketset.get::<TcpSocket>(self.connections.get(&connection).unwrap().smoltcp_handle);
if socket.may_send() {
let consumed = socket.send_slice(event.buffer).unwrap();
handler.consume_data(OutgoingDirection::ToClient, consumed);
}
}
}
fn tun_event(&mut self, event: &Event) {
if event.is_readable() {
while let Some((rx_token, _)) = self.tun.receive() {
if let Err(err) = rx_token.consume(Instant::now(), |frame| {
self.receive_tun(frame);
Ok(())
}) {
panic!("Error: {}", err);
}
}
}
}
fn mio_socket_event(&mut self, event: &Event) {
let connection = *self.token_to_connection.get(&event.token()).unwrap();
if event.is_read_closed() {
{
let mut socket = self.socketset.get::<TcpSocket>(self.connections.get(&connection).unwrap().smoltcp_handle);
socket.close();
}
self.expect_smoltcp_send();
self.remove_connection(&connection.clone());
return;
}
if event.is_readable() {
{
let conn = self.managers.get_mut(&connection).unwrap();
let state = self.connections.get_mut(&connection).unwrap();
let mut buf = [0u8; 4096];
let read = state.mio_stream.read(&mut buf).unwrap();
let event = IncomingDataEvent {
direction: IncomingDirection::FromServer,
buffer: &buf[0..read],
};
conn.push_data(event);
}
// We have read from the proxy server and pushed the data to the connection handler.
// Thus, expect data to be processed (e.g. decapsulated) and forwarded to the client.
//self.expect_smoltcp_send();
self.write_to_client(&connection);
self.expect_smoltcp_send();
}
if event.is_writable() {
self.write_to_server(&connection);
}
}
fn udp_event(&mut self, _event: &Event) {
}
pub(crate) fn run(&mut self) {
let mut events = Events::with_capacity(1024);
loop {
self.poll.poll(&mut events, None).unwrap();
for event in events.iter() {
if event.token() == self.tun_token {
self.tun_event(event);
} else if event.token() == self.udp_token {
self.udp_event(event);
} else {
self.mio_socket_event(event);
}
}
}
}
}

80
src/virtdevice.rs Normal file
View file

@ -0,0 +1,80 @@
use smoltcp::phy;
use smoltcp::phy::{Device, DeviceCapabilities};
use smoltcp::time::Instant;
#[derive(Default)]
pub struct VirtualTunDevice {
capabilities: DeviceCapabilities,
inbuf: Vec<Vec<u8>>,
outbuf: Vec<Vec<u8>>
}
impl VirtualTunDevice {
pub fn inject_packet(self: &mut Self, buffer: &[u8]) {
let vec = Vec::from(buffer);
self.inbuf.push(vec);
}
pub fn exfiltrate_packet(self: &mut Self, ) -> Option<Vec<u8>> {
self.outbuf.pop()
}
}
pub struct VirtRxToken {
buffer: Vec<u8>,
}
impl phy::RxToken for VirtRxToken {
fn consume<R, F>(mut self, _timestamp: Instant, f: F) -> smoltcp::Result<R>
where
F: FnOnce(&mut [u8]) -> smoltcp::Result<R>,
{
f(&mut self.buffer[..])
}
}
pub struct VirtTxToken<'a>(&'a mut VirtualTunDevice);
impl<'a> phy::TxToken for VirtTxToken<'a> {
fn consume<R, F>(self, _timestamp: Instant, len: usize, f: F) -> smoltcp::Result<R>
where
F: FnOnce(&mut [u8]) -> smoltcp::Result<R>,
{
let mut buffer = vec![0; len];
let result = f(&mut buffer);
self.0.outbuf.push(Vec::from(buffer));
result
}
}
impl<'a> Device<'a> for VirtualTunDevice {
type RxToken = VirtRxToken;
type TxToken = VirtTxToken<'a>;
fn receive(&'a mut self) -> Option<(Self::RxToken, Self::TxToken)> {
if let Some(buffer) = self.inbuf.pop() {
let rx = Self::RxToken { buffer };
let tx = VirtTxToken(self);
return Some((rx, tx));
}
None
}
fn transmit(&'a mut self) -> Option<Self::TxToken> {
return Some(VirtTxToken(self));
}
fn capabilities(&self) -> DeviceCapabilities {
self.capabilities.clone()
}
}
impl<'a> VirtualTunDevice {
pub fn new(capabilities: DeviceCapabilities) -> Self {
Self {
capabilities,
..Default::default()
}
}
}